/// <summary>
/// Read grid data - LonLat
/// </summary>
/// <param name="timeIdx">Time index</param>
/// <param name="varIdx">Variable index</param>
/// <param name="levelIdx">Level index</param>
/// <returns>Grid data</returns>
public GridData GetGridData_LonLat(int timeIdx, int varIdx, int levelIdx)
{
FileStream fs = new FileStream(this.FileName, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
//Read byte data
br.BaseStream.Seek(_primaryHeader.Total_Header_Length, SeekOrigin.Begin);
int length = (int)(br.BaseStream.Length - br.BaseStream.Position);
byte[] imageBytes = br.ReadBytes(length);
br.Close();
fs.Close();
//Get grid data
int i, j;
int tNL = _imageStructure.NL * _imageSegmentID.Total_No_Image_Segm;
GridData gridData = new GridData();
double[] x = new double[XNum];
double[] y = new double[YNum];
double cof = Math.Pow(2, -16);
double CFAC_d = _imageNavigation.CFAC * cof;
double LFAC_d = _imageNavigation.LFAC * cof;
double radius = 6378137.0;
for (i = 0; i < XNum; i++)
{
x[i] = (double)(i + 1 - _imageNavigation.COFF) / CFAC_d * radius / 10;
}
int stNL = tNL - _imageSegmentID.Line_No_Image_Segm + 1 - YNum;
for (i = 0; i < YNum; i++)
{
y[i] = (double)(stNL + i - _imageNavigation.LOFF) / LFAC_d * radius / 10;
}
gridData.X = x;
gridData.Y = y;
double[,] gData = new double[YNum, XNum];
for (i = 0; i < YNum; i++)
{
for (j = 0; j < XNum; j++)
{
gData[YNum - i - 1, j] = Bytes2Number.Uint2(imageBytes[i * XNum * 2 + j * 2], imageBytes[1 * XNum * 2 + j * 2 + 1]);
}
}
gridData.Data = gData;
return(gridData);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="br">binary reader</param>
public GRIB1ProductDefineSection(BinaryReader br)
{
byte[] bytes = br.ReadBytes(3);
Length = Bytes2Number.Uint3(bytes[0], bytes[1], bytes[2]);
br.BaseStream.Seek(-3, SeekOrigin.Current);
bytes = br.ReadBytes(Length);
TableVersion = Convert.ToInt32(bytes[3]);
CenterID = Convert.ToInt32(bytes[4]);
TypeGenProcess = Convert.ToInt32(bytes[5]);
GridID = Convert.ToInt32(bytes[6]);
int ifExists = Convert.ToInt32(bytes[7]);
GDSExist = (ifExists & 128) == 128;
BMSExist = (ifExists & 64) == 64;
ParameterIndicator = Convert.ToInt32(bytes[8]);
Parameter = GRIBParameterTable.GetDefaultParameter(ParameterIndicator);
LevelType = Convert.ToInt32(bytes[9]);
LevelValue = Bytes2Number.Uint2(bytes[10], bytes[11]);
int year = Convert.ToInt32(bytes[12]);
int month = Convert.ToInt32(bytes[13]);
int day = Convert.ToInt32(bytes[14]);
int hour = Convert.ToInt32(bytes[15]);
int minute = Convert.ToInt32(bytes[16]);
ForecastTimeUnit = Convert.ToInt32(bytes[17]);
P1 = Convert.ToInt32(bytes[18]);
P2 = Convert.ToInt32(bytes[19]);
TimeRangeIndicator = Convert.ToInt32(bytes[20]);
AveInclude = Bytes2Number.Int2(bytes[21], bytes[22]);
NumMissing = Convert.ToInt32(bytes[23]);
InitialCentral = Convert.ToInt32(bytes[24]);
BaseTime = new DateTime((InitialCentral - 1) * 100 + year, month, day, hour, minute, 0);
SubCenterID = Convert.ToInt32(bytes[25]);
DecimalScale = Bytes2Number.Int2(bytes[26], bytes[27]); //octets 27-28
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="br">binary reader</param>
public GRIB2DataRepresentationSection(BinaryReader br)
{
long sectionEnd = br.BaseStream.Position;
Length = Bytes2Number.Int4(br);
sectionEnd += Length;
SectionNum = br.ReadByte();
DataPoints = Bytes2Number.Int4(br);
DataTemplateNum = Bytes2Number.Uint2(br);
switch (DataTemplateNum)
{ // Data Template Number
case 0:
case 1: // 0 - Grid point data - simple packing
// 1 - Matrix values - simple packing
//ReferenceValue = br.ReadSingle();
ReferenceValue = Bytes2Number.Float(br);
BinaryScaleFactor = Bytes2Number.Int2(br);
DecimalScaleFactor = Bytes2Number.Int2(br);
NumberOfBits = br.ReadByte();
//System.out.println( "DRS numberOfBits=" + numberOfBits );
originalType = br.ReadByte();
//System.out.println( "DRS originalType=" + originalType );
if (DataTemplateNum == 0)
{
break;
}
// case 1 not implememted
//System.out.println("DRS dataTemplate=1 not implemented yet");
break;
case 2:
case 3: // Grid point data - complex packing
//System.out.println( "DRS dataTemplate=" + dataTemplate );
// octet 12 - 15
//ReferenceValue = br.ReadSingle();
ReferenceValue = Bytes2Number.Float(br);
// octet 16 - 17
BinaryScaleFactor = Bytes2Number.Int2(br);
// octet 18 - 19
DecimalScaleFactor = Bytes2Number.Int2(br);
// octet 20
NumberOfBits = br.ReadByte();
//System.out.println( "DRS numberOfBits=" + numberOfBits );
// octet 21
originalType = br.ReadByte();
//System.out.println( "DRS originalType=" + originalType );
// octet 22
splittingMethod = br.ReadByte();
//System.out.println( "DRS splittingMethod=" +
// splittingMethod );
// octet 23
MissingValueManagement = br.ReadByte();
//System.out.println( "DRS MissingValueManagement=" +
// MissingValueManagement );
// octet 24 - 27
PrimaryMissingValue = br.ReadSingle();
// octet 28 - 31
SecondaryMissingValue = br.ReadSingle();
// octet 32 - 35
NumberOfGroups = Bytes2Number.Int4(br);
//System.out.println( "DRS numberOfGroups=" +
// numberOfGroups );
// octet 36
ReferenceGroupWidths = br.ReadByte();
//System.out.println( "DRS referenceGroupWidths=" +
// referenceGroupWidths );
// octet 37
BitsGroupWidths = br.ReadByte();
// according to documentation subtract referenceGroupWidths
// TODO: check again and delete
//bitsGroupWidths = bitsGroupWidths - referenceGroupWidths;
//System.out.println( "DRS bitsGroupWidths=" +
// bitsGroupWidths );
// octet 38 - 41
ReferenceGroupLength = Bytes2Number.Int4(br);
//System.out.println( "DRS referenceGroupLength=" +
// referenceGroupLength );
// octet 42
LengthIncrement = br.ReadByte();
//System.out.println( "DRS lengthIncrement=" +
// lengthIncrement );
// octet 43 - 46
LengthLastGroup = Bytes2Number.Int4(br);
//System.out.println( "DRS lengthLastGroup=" +
// lengthLastGroup );
// octet 47
BitsScaledGroupLength = br.ReadByte();
//System.out.println( "DRS bitsScaledGroupLength=" +
// bitsScaledGroupLength );
if (DataTemplateNum == 2)
{
break;
}
// case 3 // complex packing & spatial differencing
// octet 48
OrderSpatial = br.ReadByte();
//System.out.println( "DRS orderSpatial=" + orderSpatial);
// octet 49
DescriptorSpatial = br.ReadByte();
//System.out.println( "DRS descriptorSpatial=" + descriptorSpatial);
break;
case 40:
case 40000: // Grid point data - JPEG 2000 Code Stream Format
//System.out.println( "DRS dataTemplate=" + dataTemplate );
//ReferenceValue = br.ReadSingle();
ReferenceValue = Bytes2Number.Float(br);
BinaryScaleFactor = Bytes2Number.Int2(br);
DecimalScaleFactor = Bytes2Number.Int2(br);
NumberOfBits = br.ReadByte();
//System.out.println( "DRS numberOfBits=" + numberOfBits );
originalType = br.ReadByte();
//System.out.println( "DRS originalType=" + originalType );
compressionMethod = br.ReadByte();
//System.out.println( "DRS compressionMethod=" + compressionMethod );
compressionRatio = br.ReadByte();
//System.out.println( "DRS compressionRatio=" + compressionRatio );
break;
default:
break;
}
//Set stream position to the section end
br.BaseStream.Position = sectionEnd;
}
/// <summary>
/// Read data info
/// </summary>
/// <param name="aFile">file path</param>
public override void ReadDataInfo(string aFile)
{
this.FileName = aFile;
FileStream fs = new FileStream(aFile, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
int headerType;
int headerRecordLength;
//Read primary header
_primaryHeader.Header_Type = br.ReadByte();
_primaryHeader.Header_Record_Length = Bytes2Number.Uint2(br);
_primaryHeader.File_Type_Code = br.ReadByte();
if (_primaryHeader.File_Type_Code != 0)
{
return;
}
_primaryHeader.Total_Header_Length = Bytes2Number.UInt(br.ReadBytes(4));
_primaryHeader.Data_Field_Length = Bytes2Number.UInt(br.ReadBytes(8));
_dataLength = (int)(br.BaseStream.Length - br.BaseStream.Position);
//Read secondary headers
while (true)
{
headerType = br.ReadByte();
if (br.BaseStream.Position > _primaryHeader.Total_Header_Length)
{
break;
}
if (headerType > 132)
{
break;
}
switch (headerType)
{
case 1:
//Read header type#1 - Image Structure
_imageStructure.Header_Type = headerType;
_imageStructure.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_imageStructure.NB = br.ReadByte();
_imageStructure.NC = Bytes2Number.UInt(br.ReadBytes(2));
_imageStructure.NL = Bytes2Number.UInt(br.ReadBytes(2));
_imageStructure.Compression_Flag = br.ReadByte();
break;
case 2:
//Read header type#2 - Image Navigation
_imageNavigation.Header_Type = headerType;
_imageNavigation.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_imageNavigation.Projection_Name = ASCIIEncoding.ASCII.GetString(br.ReadBytes(32)).Trim();
_imageNavigation.CFAC = Bytes2Number.Int4(br);
_imageNavigation.LFAC = Bytes2Number.Int4(br);
_imageNavigation.COFF = Bytes2Number.Int4(br);
_imageNavigation.LOFF = Bytes2Number.Int4(br);
//_imageNavigation.CFAC = BitConverter.ToInt32(br.ReadBytes(4), 0);
//_imageNavigation.LFAC = BitConverter.ToInt32(br.ReadBytes(4), 0);
//_imageNavigation.COFF = BitConverter.ToInt32(br.ReadBytes(4), 0);
//_imageNavigation.LOFF = BitConverter.ToInt32(br.ReadBytes(4), 0);
break;
case 3:
//Read header type#3 - Image Data Function
_imageDataFunction.Header_Type = headerType;
_imageDataFunction.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_imageDataFunction.Data_Definition_Block = ASCIIEncoding.ASCII.GetString(br.ReadBytes(_imageDataFunction.Header_Record_Length - 3));
break;
case 4:
//Read header type#4 - Annotation
_annotation.Header_Type = headerType;
_annotation.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_annotation.Annotation_Text = ASCIIEncoding.ASCII.GetString(br.ReadBytes(_annotation.Header_Record_Length - 3));
break;
case 5:
//Read header type#5 - Time Stamp
_timeStamp.Header_Type = headerType;
_timeStamp.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_timeStamp.CDS_P_Field = br.ReadByte();
_timeStamp.CDS_T_Field = Bytes2Number.UInt(br.ReadBytes(6));
break;
case 128:
//Read header type#128 - Image Segment Identification
_imageSegmentID.Header_Type = headerType;
_imageSegmentID.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_imageSegmentID.Image_Segm_Seq_No = br.ReadByte();
_imageSegmentID.Total_No_Image_Segm = br.ReadByte();
_imageSegmentID.Line_No_Image_Segm = Bytes2Number.UInt(br.ReadBytes(2));
break;
case 130: //Read header type#130 - Image compensation information header
_imageCompInfo.Header_Type = headerType;
_imageCompInfo.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_imageCompInfo.Image_Compensation_Information = ASCIIEncoding.ASCII.GetString(br.ReadBytes(_imageCompInfo.Header_Record_Length - 3));
break;
case 131: //Read header type#131 - Image observation time
_imageObsTime.Header_Type = headerType;
_imageObsTime.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_imageObsTime.Image_Observation_Time = ASCIIEncoding.ASCII.GetString(br.ReadBytes(_imageObsTime.Header_Record_Length - 3));
break;
case 132: //Read header type#132 - Image quality information
_imageQualityInfo.Header_Type = headerType;
_imageQualityInfo.Header_Record_Length = Bytes2Number.UInt(br.ReadBytes(2));
_imageQualityInfo.Image_Quality_Information = ASCIIEncoding.ASCII.GetString(br.ReadBytes(_imageQualityInfo.Header_Record_Length - 3));
break;
default:
headerRecordLength = Bytes2Number.UInt(br.ReadBytes(2));
br.ReadBytes(headerRecordLength - 3);
break;
}
}
//Close file
br.Close();
fs.Close();
//Get projection
GetProjection(_imageNavigation.Projection_Name);
int tNL = _imageStructure.NL * _imageSegmentID.Total_No_Image_Segm;
double[] x = new double[XNum];
double[] y = new double[tNL];
double cof = Math.Pow(2, -16);
double CFAC_d = _imageNavigation.CFAC * cof;
double LFAC_d = _imageNavigation.LFAC * cof;
double radius = 6378137.0;
int i;
for (i = 0; i < XNum; i++)
{
x[i] = (double)(i + 1 - _imageNavigation.COFF) / CFAC_d * radius / 10;
}
for (i = 0; i < tNL; i++)
{
y[i] = (double)(i + 1 - _imageNavigation.LOFF) / LFAC_d * radius / 10;
}
Dimension xdim = new Dimension(DimensionType.X);
xdim.SetValues(x);
this.XDimension = xdim;
Dimension ydim = new Dimension(DimensionType.Y);
ydim.SetValues(y);
this.YDimension = ydim;
//Set variable list
varList = new List <string>();
varList.Add("var");
Variable var = new Variable();
var.Name = "var";
var.SetDimension(ydim);
var.SetDimension(xdim);
List <Variable> variables = new List <Variable>();
variables.Add(var);
this.Variables = variables;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="br">binary reader</param>
public GRIB1GridDefineSection(BinaryReader br)
{
byte[] bytes = br.ReadBytes(3);
Length = Bytes2Number.Uint3(bytes[0], bytes[1], bytes[2]);
br.BaseStream.Seek(-3, SeekOrigin.Current);
bytes = br.ReadBytes(Length);
NV = Convert.ToInt32(bytes[3]);
P_VorL = Convert.ToInt32(bytes[4]);
GridType = Convert.ToInt32(bytes[5]);
double checkSum = GridType;
if (GridType != 50) //Values same up to resolution
{
NX = Bytes2Number.Uint2(bytes[6], bytes[7]);
if (NX >= 65535)
{
ThinnedGrid = true;
}
checkSum = 7 * checkSum + NX;
NY = Bytes2Number.Uint2(bytes[8], bytes[9]);
checkSum = 7 * checkSum + NY;
Lat1 = Bytes2Number.Int3(bytes[10], bytes[11], bytes[12]) / 1000.0;
checkSum = 7 * checkSum + Lat1;
Lon1 = Bytes2Number.Int3(bytes[13], bytes[14], bytes[15]) / 1000.0;
checkSum = 7 * checkSum + Lon1;
Resolution = Convert.ToInt32(bytes[16]);
}
switch (GridType)
{
case 0: // Standard Lat/Lon grid, no rotation
case 4: //Gaussian Lat/Lon grid
case 10: // Rotated Lat/Lon grid
case 201: //Arkawa semi-staggered E-grid on rotated lat/lon grid
case 202: //Arakawa filled E -grid on rotated lat/lon grid
Lat2 = Bytes2Number.Int3(bytes[17], bytes[18], bytes[19]) / 1000.0;
checkSum = 7 * checkSum + Lat2;
Lon2 = Bytes2Number.Int3(bytes[20], bytes[21], bytes[22]) / 1000.0;
checkSum = 7 * checkSum + Lon2;
//Increments given
if (Resolution == 128)
{
DX = Bytes2Number.Uint2(bytes[23], bytes[24]) / 1000.0;
//if (ThinnedGrid)
//{
// NX = 73;
// DX = 1.25;
//}
if (GridType == 4)
{
NP = Bytes2Number.Uint2(bytes[25], bytes[26]);
DY = NP / 1000.0; //try for error data
}
else
{
DY = Bytes2Number.Uint2(bytes[25], bytes[26]) / 1000.0;
}
ScanMode = Convert.ToInt32(bytes[27]);
if ((ScanMode & 128) != 0)
{
DX = -DX;
}
//if ((ScanMode & 64) != 64 && Lat2 < Lat1)
// DY = -DY;
//if ((ScanMode & 64) != 64 || Lat2 < Lat1)
// DY = -DY;
if (Lat2 < Lat1)
{
DY = -DY;
}
}
else
{
//Calculate increments
DX = (Lon2 - Lon1) / (NX - 1);
DY = (Lat2 - Lat1) / (NY - 1);
}
if (DX < 0)
{
XReverse = true;
}
if (DY < 0)
{
YReverse = true;
}
if (ThinnedGrid)
{
ThinnedXNums = new int[NY];
ThinnedGridNum = 0;
for (int i = 0; i < NY; i++)
{
ThinnedXNums[i] = Bytes2Number.Int2(bytes[32 + i * 2], bytes[33 + i * 2]);
ThinnedGridNum += ThinnedXNums[i];
if (i == 0)
{
NX = ThinnedXNums[i];
}
else
{
if (NX < ThinnedXNums[i])
{
NX = ThinnedXNums[i];
}
}
}
DX = Math.Abs(Lon2 - Lon1) / (NX - 1);
}
if (GridType == 10)
{
// Rotated Lat/Lon grid, Lat (octets 33-35), Lon (octets 36-38), rotang (octets 39-42)
Latsp = Bytes2Number.Int3(bytes[32], bytes[33], bytes[34]) / 1000.0;
Lonsp = Bytes2Number.Int3(bytes[35], bytes[36], bytes[37]) / 1000.0;
Rotang = Bytes2Number.Int4(bytes[38], bytes[39], bytes[40], bytes[41]) / 1000.0;
}
break;
case 1: //Mercator projection
Lat2 = Bytes2Number.Int3(bytes[17], bytes[18], bytes[19]) / 1000.0;
checkSum = 7 * checkSum + Lat2;
Lon2 = Bytes2Number.Int3(bytes[20], bytes[21], bytes[22]) / 1000.0;
checkSum = 7 * checkSum + Lon2;
Latin1 = Bytes2Number.Int3(bytes[23], bytes[24], bytes[25]) / 1000.0;
checkSum = 7 * checkSum + Latin1;
ScanMode = bytes[27];
DX = Bytes2Number.Int3(bytes[28], bytes[29], bytes[30]);
DY = Bytes2Number.Int3(bytes[31], bytes[32], bytes[33]);
break;
case 3: //Lambert projection
Lov = Bytes2Number.Int3(bytes[17], bytes[18], bytes[19]) / 1000.0;
checkSum = 7 * checkSum + Lov;
DX = Bytes2Number.Int3(bytes[20], bytes[21], bytes[22]);
DY = Bytes2Number.Int3(bytes[23], bytes[24], bytes[25]);
Proj_Center = bytes[26];
ScanMode = bytes[27];
Latin1 = Bytes2Number.Int3(bytes[28], bytes[29], bytes[30]) / 1000.0;
checkSum = 7 * checkSum + Latin1;
Latin2 = Bytes2Number.Int3(bytes[31], bytes[32], bytes[33]) / 1000.0;
checkSum = 7 * checkSum + Latin2;
Latsp = Bytes2Number.Int3(bytes[34], bytes[35], bytes[36]) / 1000.0;
checkSum = 7 * checkSum + Latsp;
Lonsp = Bytes2Number.Int3(bytes[37], bytes[38], bytes[39]) / 1000.0;
checkSum = 7 * checkSum + Lonsp;
break;
case 5: //Polar stereographic projection
case 87:
Lov = Bytes2Number.Int3(bytes[17], bytes[18], bytes[19]) / 1000.0;
checkSum = 7 * checkSum + Lov;
if (GridType == 87)
{
Lon2 = Bytes2Number.Int3(bytes[20], bytes[21], bytes[22]) / 1000.0;
checkSum = 7 * checkSum + Lon2;
}
DX = Bytes2Number.Int3(bytes[20], bytes[21], bytes[22]);
DY = Bytes2Number.Int3(bytes[23], bytes[24], bytes[25]);
Proj_Center = bytes[26];
ScanMode = bytes[27];
break;
default:
break;
}
// This switch uses the grid_type to define how to handle the
// southpole information.
switch (GridType)
{
case 0:
// Standard Lat/Lon grid, no rotation
Latsp = -90.0;
Lonsp = 0.0;
Rotang = 0.0;
break;
default:
// No knowledge yet
// NEED to fix this later, if supporting other grid types
Latsp = Double.NaN;
Lonsp = Double.NaN;
Rotang = Double.NaN;
break;
}
}
